If a package is contaminated, a timing device marks it so that it can be removed from the batch. Suitable for snack foods and granular or powdered products.
Eriez Magnetics: Vf/f/s metal detector
The E-Z Tec® VFS metal detector from Eriez (Cleveland, OH) detects minute pieces of ferrous contamination in gravity-fed material. Its low profile enables it to fit between the checkweigher and the vf/f/s system so that it detects just prior to packaging.